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AUSCERT External Security Bulletin Redistribution
ESB-2019.3126
Web Gateway update fixes two vulnerabilities (CVE-2019-3635
and CVE-3639) (SB10293)
15 August 2019
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: McAfee Web Gateway
Publisher: McAfee
Operating System: Windows
Linux variants
Mac OS
Impact/Access: Access Confidential Data -- Remote with User Interaction
Unauthorised Access -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2019-3639 CVE-2019-3635
Original Bulletin:
https://kc.mcafee.com/corporate/index?page=content&id=SB10293
- --------------------------BEGIN INCLUDED TEXT--------------------
McAfee Security Bulletin - Web Gateway update fixes two vulnerabilities
(CVE-2019-3635 and CVE-3639)
Security Bulletins ID : SB10293
Last Modified : 8/13/2019
Summary
First Published: August 13, 2019
+-----------------+-----------------------------------------------------------+
|Impact of |CVE-2019-3635: Proxy: Cross-Frame Scripting vulnerability |
|Vulnerability: |CVE-2019-3639: UI: Cross-Frame Scripting vulnerability |
+-----------------+-----------------------------------------------------------+
|CVE ID: |CVE-2019-3635 |
| |CVE-2019-3639 |
+-----------------+-----------------------------------------------------------+
|Severity Rating: |CVE-2019-3635: Medium |
| |CVE-2019-3639: High |
+-----------------+-----------------------------------------------------------+
|CVSS v3 Base/ |CVE-2019-3635: 4.3 / 4.1 |
|Temporal Scores: |CVE-2019-3639: 7.1 / 5.7 |
+-----------------+-----------------------------------------------------------+
| |Install or update to McAfee Web Gateway (MWG) 7.7.2.23 |
|Recommendations: |Install or update to MWG 7.8.2.12 (main release) |
| |Install or update to MWG 8.1.5 (controlled release) |
+-----------------+-----------------------------------------------------------+
|Security Bulletin|None |
|Replacement: | |
+-----------------+-----------------------------------------------------------+
| |CVE-2019-3635: MWG 7.7.2 earlier than MWG 7.7.2.23; MWG |
|Affected |7.8.2 earlier than MWG 7.8.2.12, 8.x earlier than 8.1.5 |
|Software: |CVE-2019-3639: MWG 7.8.2 earlier than MWG 7.8.2.12, 8.x |
| |earlier than 8.1.5 |
+-----------------+-----------------------------------------------------------+
|Location of |https://contentsecurity.mcafee.com/ |
|updated software:| |
+-----------------+-----------------------------------------------------------+
Article contents:
o Vulnerability Description
o Remediation
o Workaround
o Acknowledgments
o Frequently Asked Questions (FAQs)
o Resources
o Disclaimer
Vulnerability Description
This Security Bulletin address two vulnerabilities in MWG.
1. CVE-2019-3635:
Exfiltration of data in McAfee Web Gateway (MWG) 7.8.2.x earlier than
7.8.2.12 allows attackers to obtain sensitive data via crafting a complex
webpage that will trigger the Web Gateway to block the user accessing an
iframe.
https://web.nvd.nist.gov/view/vuln/detailvulnId=CVE-2019-3635
https://cve.mitre.org/cgi-bin/cvename.cginame=CVE-2019-3635
2. CVE-2019-3639:
Clickjack vulnerability in the administrator web console in McAfee Web
Gateway (MWG) 7.8.2.x earlier than 7.8.2.12 allows remote attackers to
conduct clickjacking attacks via a crafted web page that contains an iframe
as the appliance does not send an X-Frame-Options HTTP header.
https://web.nvd.nist.gov/view/vuln/detailvulnId=CVE-2019-3639
https://cve.mitre.org/cgi-bin/cvename.cginame=CVE-2019-3639
Remediation
To remediate these issues, go to the Product Downloads site, and download the
applicable product update file:
+-------+--------+------------+------------------------------------+----------+
|Product|Version |Type |File Name |Release |
| | | | |Date |
+-------+--------+------------+------------------------------------+----------+
|MWG |7.7.2.23|Main Release|mwgappl-7.7.2.23.0-29637-x.86_64.iso|August 13,|
| | | | |2019 |
+-------+--------+------------+------------------------------------+----------+
|MWG |7.8.2.12|Main Release|mwgappl-7.8.2.12.0-29703-x.86_64.iso|August 13,|
| | | | |2019 |
+-------+--------+------------+------------------------------------+----------+
|MWG |8.1.5 |Controlled |mwgappl-8.1.5-29705.x.86_64.iso |August 13,|
| | |Release | |2019 |
+-------+--------+------------+------------------------------------+----------+
Download and Installation Instructions
All documentation and software relating to this and other MWG releases can be
found on https://contentsecurity.mcafee.com/ .
Workaround
CVE-2019-3635:
An administrator can add the rule shown below at the start of the policy, to
enforce a behavior that mitigates this vulnerability. By setting this header, a
browser does not render the page in an iframe, so that no data can be
exfiltrated.
Applies To: Requests (and IM)
Condition: Always
Action: Continue
Events: Header.Block.Add ("X-Frame-Options", "deny")
Acknowledgments
McAfee credits Zezadas for reporting CVE-2019-3635 - Proxy: Cross-Frame
Scripting vulnerability.
McAfee credits Erik Roos for reporting CVE-2019-3639 - UI: Cross-Frame
Scripting vulnerability.
Frequently Asked Questions (FAQs)
How do I know if my McAfee product is vulnerable or not
For MWG:
Use the following instructions for MWG:
1. Open the Administrator's UI.
2. Log on. If the product version number displayed is older than the versions
specified in the table above, it is vulnerable.
What is CVSS
CVSS, or Common Vulnerability Scoring System, is the result of the National
Infrastructure Advisory Council's effort to standardize a system of assessing
the criticality of a vulnerability. This system offers an unbiased criticality
score between 0 and 10 that customers can use to judge how critical a
vulnerability is and plan accordingly. For more information, visit the CVSS
website at: http://www.first.org/cvss/ .
When calculating CVSS scores, McAfee has adopted a philosophy that fosters
consistency and repeatability. Our guiding principle for CVSS scoring is to
score the exploit under consideration by itself. We consider only the immediate
and direct impact of the exploit under consideration. We do not factor into a
score any potential follow-on exploits that might be made possible by the
successful exploitation of the issue being scored.
What are the CVSS scoring metrics
1. CVE-2019-3635: Proxy: Cross-Frame Scripting vulnerability
+------------------------+----------------+
|Base Score |4.3 |
+------------------------+----------------+
|Attack Vector (AV) |Network (N) |
+------------------------+----------------+
|Attack Complexity (AC) |Low (L) |
+------------------------+----------------+
|Privileges Required (PR)|None (N) |
+------------------------+----------------+
|User Interaction (UI) |Required (R) |
+------------------------+----------------+
|Scope (S) |Unchanged (U) |
+------------------------+----------------+
|Confidentiality (C) |Low (L) |
+------------------------+----------------+
|Integrity (I) |None (N) |
+------------------------+----------------+
|Availability (A) |None (N) |
+------------------------+----------------+
|Temporal Score (Overall)|4.1 |
+------------------------+----------------+
|Exploitability (E) |High (H) |
+------------------------+----------------+
|Remediation Level (RL) |Official Fix (O)|
+------------------------+----------------+
|Report Confidence (RC) |Confirmed (C) |
+------------------------+----------------+
NOTE: The below CVSS version 3.0 vector was used to generate this score.
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/
C:L/I:N/A:N/E:H/RL:O/RC:C
2. CVE-2019-3639: UI: Cross-Frame Scripting vulnerability
+------------------------+----------------+
|Base Score |7.1 |
+------------------------+----------------+
|Attack Vector (AV) |Network (N) |
+------------------------+----------------+
|Attack Complexity (AC) |Low (L) |
+------------------------+----------------+
|Privileges Required (PR)|None (N) |
+------------------------+----------------+
|User Interaction (UI) |Required (R) |
+------------------------+----------------+
|Scope (S) |Unchanged (U) |
+------------------------+----------------+
|Confidentiality (C) |High (H) |
+------------------------+----------------+
|Integrity (I) |Low (L) |
+------------------------+----------------+
|Availability (A) |None (N) |
+------------------------+----------------+
|Temporal Score (Overall)|5.7 |
+------------------------+----------------+
|Exploitability (E) |Unproven (U) |
+------------------------+----------------+
|Remediation Level (RL) |Official Fix (O)|
+------------------------+----------------+
|Report Confidence (RC) |Unknown (U) |
+------------------------+----------------+
NOTE: The below CVSS version 3.0 vector was used to generate this score.
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/
C:H/I:L/A:N/E:U/RL:O/RC:U
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